Reapply "declaraing the variable 'result' in capitalise function"

This reverts commit a7d7dfd.

Author: djebsoft

Sprint-2/1-key-errors/0.js

@@ -13,6 +13,6 @@ function capitalise(str) {
 // but it creates a new one.
 // =============> my new code: 
 function capitalise(str) {
-  result = `${str[0].toUpperCase()}${str.slice(1)}`;
+  let result = `${str[0].toUpperCase()}${str.slice(1)}`;
   return resault;
 }